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Permanent fire line is made of Kevlar material, commonly used fire retardant cable line on the market, that is, after leaving the line of fire with a second self-destruction. Size 0 #, 5 #, 10 #, 20 #, 30 #, 40 # and so on. Fire possible to connect a variety of natural obstacles, such as rivers, roads, fire lines to form networks. To prevent the spread of fire in forest fire prone areas open so that no combustible or noncombustible with combustible material. Fire lines sometimes for road and fire suppression control lines. Fire possible to connect a variety of natural obstacles, such as rivers, roads, fire lines to form networks. China since 1952, opened fire on both sides of the railway line in the northeastern forest. Since 1956, North County, Heilongjiang Province, Yichun Inner Mongolia Morin Dawa Daur Autonomous Banner, etc., has in the ditch along the river grasslands and ponds, the use of rhythm before frost after frost, opened fire line using fire method. In 1960, in the northeastern border region began to use a tractor to turn adobe belt. Since 1978, the Heilongjiang Province and the Inner Mongolia Autonomous Region began a trial of chemical weed control method opened fire lines.